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Public-images-osm logo.svg clli
Osm element key.svg
Common Language Location Identifier Code
Used on these elements
may be used on nodesshould not be used on waysmay be used on areasmay be used on relations
Useful combination
Status: In use


See wikipedia:CLLI_code

CLLI code (sometimes referred to as COMMON LANGUAGE Location Identifier Code and often pronounced as silly) is a wikipedia:Common Language Information Services identifier used within the North American telecommunications industry to specify the location and function of telecommunications equipment or of a relevant location such as an international border or a supporting equipment location, like a manhole or pole.[1] Originally, they were used by Bell Telephone companies, but since all other telecommunications carriers needed to interconnect with the dominant Bell companies, CLLI code adoption eventually became universal. CLLI codes are now maintained and issued by wikipedia:Telcordia, which claims trademarks on the names "Common Language" and "CLLI".


The first six characters of a CLLI code represent the place the code refers to and contain two code elements:

  • Four characters to denote the geographical area and the geographical area type (for example, city, town, and borough), known as the Geographical code element.[2]
  • Two characters to denote the state, province, or country, known as the Geopolitical code element.[2] The codes HS (high seas) and EO (earth orbit) are reserved for ships at sea and satellites, respectively.[3]

For the various code formats, the remaining two or five characters contain one of:

  • A two-character building identifier, either two letters or two numbers, for telephone company buildings. Incumbent independent telephone companies will use two-letter identifiers with X as the first letter.
    • The two-character building identifier may be followed by three characters to identify an individual switching or non-switching entity within the building.
  • A non-building location, identified by a letter followed by four digits.
  • A client site is identified by a digit, a letter, then three more digits for non-building locations.

There are four CLLI code formats. (See: wikipedia:CLLI_code)

Value Name

It is suggested that CLLI values only contain city, state, and building codes, omit Network Site codes, be eight characters long and capitalized, such as WDSTILWS.


  1. "CLLI Codes Technical Description". Telcordia. Retrieved 22 February 2009. 
  2. 2.0 2.1 "Intercompany Responsibilities Within The Telecommunications Industry". ATIS/NIIF 0015 Issue 1.0. Retrieved 2012-06-15. 
  3. CLLI code description, Bell System Practices (AT&T standard) Section 795-100-100 Issue 5, October 1982